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Table 4 Variables included in the SDM including their type and variable importance

From: Predicting current and future suitable habitat and productivity for Atlantic populations of maritime pine (Pinus pinaster Aiton) in Spain

Type Variable Normalized importance Relative importance Summarized values for suitable habitat
Mean Max. Min. SD
Climate BIO1 11.57 100.00 12.96 15.10 8.00 1.00
Climate BIO03 11.22 93.49 3.94 4.40 3.60 0.14
Climate BIO04 10.60 81.81 413.34 565.40 307.00 60.44
Climate BIO16 9.44 59.84 447.94 662.00 241.00 77.91
Climate BIO15 9.40 59.09 42.26 53.00 27.00 4.77
Soil BD 9.28 56.85 1274.66 1506.00 1042.00 59.12
Soil SILT 8.63 44.69 32.42 44.00 20.00 3.85
Soil R 8.14 35.36 16.02 43.00 1.00 5.48
Terrain TSI 7.96 31.95 0.00 0.32 − 0.26 0.03
Soil WRB-LEV1 7.51 23.52
Soil DB200 6.26 0.00 199.82 200.00 161.00 1.37
  1. To ensure values of variable importance were expressed on a comparable scale for each of the response variable, the scores of all the predictors selected were normalized so that they added up to a unitary value (normalized importance) or were expressed as relative values. Relative importance = (VIM−VIMmin)/(VIMmax−VIMmin)
  2. 1Qualitative variable